毕设日志

Posted 2020-09-09

 

哈哈哈哈，大哥技术还是不错的。厉害厉害。

 

1.单纯前端界面好好的，然而一旦有了前后端的交互，页面出现中文乱码问题。

  解决方案：

  servlet中：

   request.setCharacterEncoding("UTF-8");

   response.setCharacterEncoding("UTF-8");

2.NoClassDefFoundException

  原因：在编译环境中没有问题，但是部署到Web容器中就不行

  解决：在lib中加入jar包，加入buildPath

3.hibernate 5.7版本有些兼容性，新写法的问题！对了，最后不必手动session.close();

http://bbs.csdn.net/topics/391955731

hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.password">xxxxxx</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost/hibernate</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="hibernate.format_sql">true</property>
        <property name="hibernate.hbm2ddl.auto">create</property>
        <property name="hibernate.show_sql">true</property>
        <property name="hibernate.current_session_context_class">thread</property>
        
        <mapping class="config.Students"/>
        <mapping resource="config/Students.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

JunitTest

 1 public class TestStudents {
 2 
 3     private SessionFactory sessionFactory;
 4     private Session session;
 5     private Transaction transaction;
 6 
 7     @Before
 8     public void init() {
 9         
10         // 获得 session工厂
11         sessionFactory = new Configuration().configure().buildSessionFactory();
12         // 获得 session
13         session = sessionFactory.getCurrentSession();
14         // 开启事务
15         transaction = session.beginTransaction();
16 
17     }
18 
19     @After
20     public void destory() {
21         transaction.commit(); // 提交事务
22 
23     }
24 
25     @Test
26     public void testSaveStudents() {
27         // 生成学生对象
28         Students students = new Students(2, "黄蓉", "女", new Date(), "桃花岛");
29         System.out.println(students.getSname() + students.getGender() + students.getAddress());
30         session.save(students); // 保存对象进入数据库
31     }
32 }